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If vec(a), vec(b), vec(c) are the positi...

If `vec(a), vec(b), vec(c)` are the position vectors of vertices A, B, C of a triangle ABC, Show that the area of the triangle is `(1)/(2) |vec(b) xx vec(c) + vec(c) xx vec(a) + vec(a) xx vec(b)|`

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